Class RecordPatternsSecondPreviewExamples

java.lang.Object

net.jrodolfo.java_evolution.java20.RecordPatternsSecondPreviewExamples

public class RecordPatternsSecondPreviewExamples
extends Object

Demonstrates record patterns as refined in the Java 20 second preview.

Record patterns reduce the gap between declaring transparent data with records and extracting that data later. Java 20 refined the preview, especially around nested record patterns, so code can match a structure and bind its interesting pieces in one place.

Record patterns became final in Java 21. This project compiles on JDK 25, so the example uses final syntax while documenting the Java 20 preview status.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	RecordPatternsSecondPreviewExamples.Address	Address record nested inside RecordPatternsSecondPreviewExamples.Customer.
static final record	RecordPatternsSecondPreviewExamples.Customer	Customer record used to demonstrate nested record deconstruction.

Constructor Summary

Constructors

Constructor	Description
RecordPatternsSecondPreviewExamples()

Method Summary

Modifier and Type	Method	Description
String	describe(Object value)	Deconstructs nested records with record patterns.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

RecordPatternsSecondPreviewExamples

public RecordPatternsSecondPreviewExamples()

Method Details

describe

public String describe(Object value)

Deconstructs nested records with record patterns.

Parameters:

value - the value to inspect

Returns:

a formatted address label